I have the 650 with the Sony lighted cover, its fine, but it wont be very protective when in my bag, things could get in between the covers and scratch etc, so I am looking for a slip case that could take the e-reader and the case together.

I have found the following that look as if they would fit ( 145 x 173 x 20 mm / 5.6 x 6.8 x .7 inch the approx size of the reader and case ).